Filter and range hood

Abstract

The present invention discloses a filter and a range hood. The filter comprises a windward surface and a leeward surface, and is provided with a plurality of air holes extending through the windward and leeward surfaces. Furthermore, the air holes comprise a flow guide section, a pressure stabilizing section, and a pressure diffuser section, which are sequentially connected along the wind direction. The cross-sectional area S1 of the flow guide section gradually decreases along the wind direction; the cross-sectional area S2 of the pressure stabilizing section is constant at all locations; and the cross-sectional area S3 of the pressure diffuser section gradually increases along the wind direction. The range hood provided by the present invention includes the aforementioned filter.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen appliances, and in particular to a filter and a range hood. Background Art

[0002] As consumers demand increasingly high levels of smoke removal from range hoods, high air volume and high static pressure have become industry goals. Existing technology uses DC motors instead of traditional AC motors, significantly increasing fan speeds. However, this leads to increasingly prominent noise issues.

[0003] Therefore, a filter is needed to solve the above problems. Summary of the Invention

[0004] The present invention aims to solve, at least to a certain extent, one of the problems existing in the existing related technologies. To this end, the present invention proposes a filter that can avoid the eddy current phenomenon when the oil smoke flows through the filter, thereby achieving noise reduction, and at the same time can increase the static pressure energy of the oil smoke when it flows out of the filter, so as to improve the filtering effect of the oil smoke.

[0005] The above purpose is achieved through the following technical solutions:

[0006] A filter screen includes a windward surface and a leeward surface, and a plurality of air holes are opened on the filter screen, wherein the air holes are arranged through the windward surface and the leeward surface, and the air holes include a guide section, a pressure stabilizing section and a pressure diffusion section connected in sequence along the wind direction, the cross-sectional area S1 of the guide section gradually decreases along the wind direction, the cross-sectional area S2 of each part of the pressure stabilizing section is equal, and the cross-sectional area S3 of the pressure diffusion section gradually increases along the wind direction.

[0007] Optionally, S1>S2.

[0008] Optionally, S3>S2.

[0009] Optionally, an angle θ is formed between a straight line at a tangent point at the free end of the diffuser and the leeward surface, and 0°<θ<90°.

[0010] Optionally, 45°<θ<80°.

[0011] Optionally, the leeward surface is arranged in parallel with the windward surface, and the inner wall of the pressure stabilizing section is arranged perpendicular to the leeward surface.

[0012] Optionally, a noise reduction groove is formed on the leeward surface between two adjacent wind holes, and a portion of the noise reduction groove away from the leeward surface has an opening.

[0013] Optionally, the opening rate of the air holes is 30%-90%.

[0014] Optionally, the opening rate of the air holes is 50%-60%.

[0015] Another aspect of the present invention provides a range hood comprising the above-mentioned filter.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] The filter provided by the present invention includes a windward surface and a leeward surface, and a plurality of air holes are provided on the filter. The air holes are arranged through the windward surface and the leeward surface, and the air holes include a guide section, a pressure stabilizing section and a pressure diffusion section connected in sequence along the wind direction. The cross-sectional area S1 of the guide section gradually decreases from bottom to top. The cross-sectional area S2 of each part of the pressure stabilizing section is equal. The cross-sectional area S3 of the pressure diffusion section gradually increases from bottom to top. Specifically, the cross-sectional area S1 of the guide section gradually decreases along the wind direction, so as to absorb the oil smoke blowing from different directions on the windward surface and introduce it into the pressure stabilizing section after rectification to avoid the generation of eddy currents. The cross-sectional area S2 of each part of the pressure stabilizing section is equal, so that the speed and pressure of the oil smoke entering the pressure stabilizing section gradually tend to be stable, thereby playing a role in stabilizing the pressure of the oil smoke. The cross-sectional area S3 of the diffuser section gradually increases along the wind direction, so that the kinetic energy of the oil smoke entering the diffuser section is converted into static pressure energy, thereby reducing the pressure loss of the oil smoke. The oil smoke flows out evenly from multiple air holes and converges together, thereby improving the uniformity of the oil smoke entering the fan of the range hood, thereby improving the oil smoke absorption effect, and at the same time helping to further reduce noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of a filter provided by a specific embodiment of the present invention at one angle;

[0019] Figure 2 is a schematic diagram of the three-dimensional structure of the filter provided by a specific embodiment of the present invention from another angle;

[0020] Figure 3 yes Figure 2 Enlarged view of point F in the middle;

[0021] Figure 4 This is a front view of a filter screen provided by a specific embodiment of the present invention;

[0022] Figure 5 yes Figure 4 Cross-section at the middle DD;

[0023] Figure 6 yes Figure 5 Enlarged view of point C in the middle.

[0024] In the picture:

[0025] 11. Windward side; 12. Leeward side;

[0026] 2. Air hole; 21. Diversion section; 22. Pressure stabilization section; 23. Pressure expansion section;

[0027] 3. Noise reduction groove; 31. Opening. DETAILED DESCRIPTION

[0028] The following examples illustrate the present invention, but the present invention is not limited to these examples. Modifications to the specific embodiments of the present invention or equivalent replacements of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed in the present invention.

[0029] Please refer to Figures 1-6 The present invention provides a filter screen, comprising a windward surface 11 and a leeward surface 12, a plurality of air holes 2 are provided on the filter screen, and the air holes 2 are arranged through the windward surface 11 and the leeward surface 12, and the air holes 2 include a guide section 21, a pressure stabilizing section 22 and a pressure expansion section 23 connected in sequence along the wind direction. The cross-sectional area S1 of the guide section 21 gradually decreases from bottom to top. The cross-sectional area S2 of each part of the pressure stabilizing section 22 is equal. The cross-sectional area S3 of the pressure expansion section 23 gradually increases from bottom to top. Specifically, as Figure 6 As shown, the oil smoke flows from the windward side 11 along the direction indicated by arrow e through the guide section 21, pressure stabilizing section 22, and diffuser section 23 of the air hole 2 to the upper side of the leeward side 12. The cross-sectional area S1 of the guide section 21 gradually decreases along the wind direction to absorb the oil smoke blowing from different directions on the windward side 11 and direct it into the pressure stabilizing section 22 after rectification, thereby avoiding the generation of eddy currents. The cross-sectional area S2 of each part of the pressure stabilizing section 22 is equal, so that the speed and pressure of the oil smoke entering the pressure stabilizing section 22 gradually tend to be stable, thereby playing a role in stabilizing the pressure of the oil smoke. The cross-sectional area S3 of the diffuser section 23 gradually increases along the wind direction so that the kinetic energy of the oil smoke entering the diffuser section 23 is converted into static pressure energy, thereby reducing the pressure loss of the oil smoke. The oil smoke flows out evenly from multiple air holes 2 and then converges together, thereby improving the uniformity of the airflow entering the range hood fan, thereby improving the oil smoke absorption effect and further reducing noise.

[0030] Optionally, S1>S2, so as to ensure the airflow absorption effect of the guide section 21 and ensure that the airflow in the guide section 21 can flow smoothly to the pressure stabilizing section 22.

[0031] Optionally, S3>S2, so as to ensure that the airflow in the pressure stabilizing section 22 can flow smoothly to the diffuser section 23, and then the kinetic energy of the airflow is converted into static pressure energy in the diffuser section 23.

[0032] Optionally, an angle θ is formed between the straight line at the tangent point at the free end of the diffuser section 23 and the leeward surface 12, where 0°<θ<90°, to ensure that the diffuser section 23 can diffuse the airflow.

[0033] Optionally, 45°<θ<80°, so that the diffuser 23 has a better diffusion effect. For example, in this embodiment, the angle θ between the straight line where the tangent point of the upper end point of the diffuser 23 is located and the leeward surface 12 is 60 degrees.

[0034] Optionally, the shapes of the multiple air holes 12 can be set to different shapes according to actual needs. All air holes can be set to the same shape, all air holes 12 can be set to different shapes, or some air holes 12 can be set to different shapes. Correspondingly, the cross-sectional areas of the guide section 21, the pressure stabilizing section 22, and the pressure diffuser section 23 can also be set according to actual needs and are not limited here.

[0035] Optionally, the leeward surface 12 is arranged parallel to the windward surface 11, and the inner wall of the pressure stabilizing section 22 is arranged perpendicular to the leeward surface 12 to facilitate the airflow into the air hole 2, and then obtain the effect of gradually stabilizing the speed and pressure of the airflow in the pressure stabilizing section 22.

[0036] Please refer to Figure 6 Optionally, a noise reduction groove 3 is formed on the leeward surface 12 between two adjacent air holes 2, and the portion of the noise reduction groove 3 away from the leeward surface 12 has an opening 31. The noise generated by the range hood enters the noise reduction groove 3 along the direction of arrow b, and then is refracted multiple times in the noise reduction groove 3 before being transmitted out from the opening 31, which can have a good noise reduction effect. Moreover, since the cross-sectional area S3 of the diffuser section 23 gradually decreases from bottom to top, the opening 31 of the noise reduction groove 3 is in a contracted state, which can suppress more noise in the noise reduction groove 3 and is not easy to be transmitted again from the outlet, thereby making the filter have a better noise reduction effect.

[0037] Optionally, the opening rate of the air hole 2 is 30%-90%, so as to ensure the filtering, rectifying, pressure stabilizing and pressure diffusing effects of the filter on the smoke, while ensuring the noise reduction effect.

[0038] Optionally, the porosity of the air hole 2 is 50%-60%. This can ensure the filtering, rectification, pressure stabilization, pressure expansion and noise reduction effects of the filter on the flue gas, while being beneficial to the production and preparation of the filter, avoiding the complexity of the filter production process caused by using an excessively high porosity, and helping to control the cost of the filter.

[0039] It should be noted that the shape of the air hole 2 can be circular, rectangular or elliptical, or it can be a waist-shaped hole, as long as the cross-sectional view of the air hole 2 is as shown in FIG. Figure 6 The structure shown is sufficient and is not limited here.

[0040] Another aspect of the present invention provides a range hood comprising the above-mentioned filter.

[0041] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. A filter screen comprising a windward surface (11) and a leeward surface (12), characterized in that: A plurality of air holes (2) are provided on the filter screen, and the air holes (2) are arranged to pass through the windward surface (11) and the leeward surface (12), and the air holes (2) include a guide section (21), a pressure stabilizing section (22) and a pressure expansion section (23) connected in sequence along the wind direction, a cross-sectional area S1 of the guide section (21) gradually decreases along the wind direction, a cross-sectional area S2 of each part of the pressure stabilizing section (22) is equal, and a cross-sectional area S3 of the pressure expansion section (23) gradually increases along the wind direction, a noise reduction groove (3) is formed on the leeward surface (12) between two adjacent air holes (2), a portion of the noise reduction groove (3) away from the leeward surface (12) has an opening (31), and a groove wall on one side of the noise reduction groove (3) is arranged to be higher than a groove wall on the other side.

2. The filter screen according to claim 1, characterized in that S1>S2.

3. The filter screen according to claim 1, characterized in that S3>S2.

4. The filter screen according to claim 1, characterized in that An included angle θ is formed between a straight line at a tangent point at the free end of the diffuser section (23) and the leeward surface (12), where 0°<θ<90°.

5. The filter screen according to claim 4, characterized in that 45°<θ<80°.

6. The filter screen according to claim 1, characterized in that The leeward surface (12) is arranged in parallel with the windward surface (11), and the inner wall of the voltage stabilizing section (22) is arranged perpendicularly to the leeward surface (12).

7. The filter screen according to any one of claims 1 to 6, characterized in that: The opening rate of the air holes (2) is 30%-90%.

8. The filter screen according to claim 7, characterized in that The opening rate of the air holes (2) is 50%-60%.

9. A range hood, characterized in that: The filter comprises the filter according to any one of claims 1 to 8.

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